First, the first
Cut the top 2-3 stems from the top of the sweet potato seedlings first, and then cut them into 4 sections to cut the petioles and leaves of the top two stems, leaving the petiole and leaves of the two stems below. Planted in the ridge, to leave a base of the petiole exposed ridge surface is appropriate, the seedling distance is generally about 15 cm. Although the sweet potato planted in advance was slower than the growth of the planter, the roots of the transporting tissue in the stem absorbed the water and organic matter in the direction reversed, the transportation speed was slowed down, and a large amount of organic nutrients was accumulated in the root, which was beneficial to the expansion of the potato tuber, and could be increased. More than half of the output.
Second, top
When the main stem of sweet potato grows to 40-50 centimeters, the top buds are picked in the morning with fine weather; when the branches grow to 30-35 centimeters, the top buds continue to be removed. This method can inhibit stem vine growth, avoid nutrient consumption, promote root enlargement, can increase production by 20 to 30%.
Third, crack irrigation
Sweet potatoes enter the root swelling stage and there will be cracks in the top soil layer. At this time, 750-1000 kg of manure per acre, 500 g of potassium dihydrogen phosphate (5 kg of superphosphate, 50 kg of grass ash, respectively, soaked in water, filtered), mixed in manure, along the cracks in the morning or evening Shi, filling the cracks with soil after irrigation, can increase production by 20 to 30%.
Fourth, spray dilute amine
When the sweet potato pod grows to 50 to 60 cm in length, 10 ml of dilute melamine or 20 to 25 ml of propagules per mu can be used to control the upper part and promote the rapid growth of roots, which can increase production by 15 to 20%.
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